and they're-- that's energy, honey, that's energy. and then energy will go to whatever you want to do. so all that wire is gonna do, deliver energy from one place to another, by just shaking the electrons. it turns out the electric field. electric field guides right through that wire. and all the electrons along that wire start responding to the field. first--it must get mixed up, and they don't know what to do, they just keep sloshing back and forth. back forth, back forth, 60 times per second, we call that 60 hertz. and that's what your ac current is. it's just electrons sloshing back and forth. kind of neat, yeah? let's take a look at this again. i'm gonna hook this up like that, and lo and behold, it lights. what's the voltage across the lamp, gang? 12. 12. what's the voltage across the lamp now? 12. 12. what's the voltage across the lamp now? 12. 12. in fact, you know what i could do? i could keep this battery in this room. and i could take these two leads and i could bring them to the other side of campus. and over in the other